Development of Passive Hydrogen Separation Membranes made from Co-Synthesized Nanoscale Cermet Powders
A powder comprised of nickel oxide and proton-conducting Nd- and Zr-doped barium cerate with a particle size on the order of 10 nm has been co-synthesized using the glycine-nitrate combustion process. The two compositions are intimately mixed with no significant elemental substitution between them after synthesis. The resulting powder must be calcined at 1000 degrees C to ensure complete reaction of the cerate components. Among the barium cerate compositions investigated, the 30 per cent Zr- and 15 per cent Nd-doped material exhibited the best combination of chemical stability in CO2 and conductivity in hydrogen environments. At least 35 vol percent Ni is required to achieve percolation in the composites. When sintering is carried out in an atmosphere which promotes reduction of nickel oxide to nickel metal, the result is a mixed conducting composite which has potential use as a hydrogen separation membrane. Composites with a relative density of 98.9 per cent and submicron grains have been prepared by hot pressing.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 921380
- Report Number(s):
- PNNL-SA-48968
- Journal Information:
- International Journal of Hydrogen Energy, 32:3631 - 3639, Journal Name: International Journal of Hydrogen Energy, 32:3631 - 3639
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sintering of Mixed-Conducting Composites for Hydrogen Membranes From Nanoscale Co-Synthesized Powders
Fabrication of dense, shaped barium cerate by the oxidation of solid metal-bearing precursors